public class demo4 {
    public static void main(String[] args) throws InterruptedException {
        Runnable runnable=new Runnable() {
                @Override
                public void run() {
                    while(true){
                        System.out.println("hello run");
                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            throw new RuntimeException(e);
                        }
                    }
                }
        };
        Thread t=new Thread(runnable);
        t.start();
        while(true){
            System.out.println("hello main");
            Thread.sleep(1000);
        }
    }
}
